Inductor Current Sensing Scheme for High-Precision Output Current Control
Date Issued
2015
Date
2015
Author(s)
Wu, Cheng-Nan
Abstract
Recently, the high brightness white light-emitted diode (LED) has become the best lighting source. A primary-side regulator (PSR) is widely used for the LED lighting application. However, the PSR often experiences the drawback of output current inaccuracy which will shorten the LED’s lift-time. The objective of this dissertation is to propose the inductor current sensing scheme (ICS2) which can be adopted to different circuit topologies to achieve high-precision output current. The proposed ICS2 senses the slope of inductor current to obtain the correct peak and valley values of inductor current. With the correct value and conduction time of the inductor current, the proposed ICS2 can achieve high-precision output current regulation. The operation principle and mathematic derivation of the proposed ICS2 are developed thoroughly. Four ICS2-based prototypes with small, middle and large power ratings for LED lighting application are built and tested. Computer simulations and experimental results are presented to confirm the performance of the proposed ICS2.
Subjects
light-emitted diode (LED)
primary-side regulator (PSR)
inductor current sensing scheme (ICS2)
current control
output current limit
constant on-time control
Type
thesis
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ntu-104-D98921012-1.pdf
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